Catalyst supports for polymer electrolyte fuel cells
| Autor: | Francis J. DiSalvo, Janet L. Hunting, Brian M. Leonard, Qin Zhou, Semeret Munie, Heather M. Edvenson, Chinmoy Ranjan, Chinmayee V. Subban |
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| Rok vydání: | 2010 |
| Předmět: |
Conservation of Natural Resources
Energy-Generating Resources Materials science Hydrogen Polymers General Mathematics Oxide General Physics and Astronomy chemistry.chemical_element Proton exchange membrane fuel cell Electrolyte Electrochemistry Catalysis chemistry.chemical_compound Electric Power Supplies Electricity X-Ray Diffraction Materials Testing Nanotechnology Electrodes Platinum Titanium General Engineering Carbon black Hydrogen-Ion Concentration chemistry Chemical engineering Biofuels Nanoparticles Carbon |
| Zdroj: | Philosophical transactions. Series A, Mathematical, physical, and engineering sciences. 368(1923) |
| ISSN: | 1364-503X |
| Popis: | A major challenge in obtaining long-term durability in fuel cells is to discover catalyst supports that do not corrode, or corrode much more slowly than the current carbon blacks used in today’s polymer electrolyte membrane fuel cells. Such materials must be sufficiently stable at low pH (acidic conditions) and high potential, in contact with the polymer membrane and under exposure to hydrogen gas and oxygen at temperatures up to perhaps 120°C. Here, we report the initial discovery of a promising class of doped oxide materials for this purpose: Ti1−xMxO2, where M=a variety of transition metals. Specifically, we show that Ti0.7W0.3O2is electrochemically inert over the appropriate potential range. Although the process is not yet optimized, when Pt nanoparticles are deposited on this oxide, electrochemical experiments show that hydrogen is oxidized and oxygen reduced at rates comparable to those seen using a commercial Pt on carbon black support. |
| Databáze: | OpenAIRE |
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